As the camera rolls for “Coco avant Chanel” (“Coco before Chanel”), starring Audrey Tautou, Chanel muse Anna Mouglalis is the latest actress set to play the late designer in another Chanel film, this one centered on her love affair with Igor Stravinsky. Set in the period of 1913 to 1925, the work, believed to be titled “Chanel et Stravinsky, l’Histoire Secrete,” which translates as “The Secret Story of Chanel and Stravinsky,” will begin filming in September, according to a source. Jan Kounen will direct, and “Casino Royale” baddie Mads Mikkelsen will play the role of Stravinsky. A Chanel spokeswoman confirmed the house will be opening its archive doors to the film’s unnamed costumer, who will also be meeting with designer Karl Lagerfeld over the coming weeks.